Matthew Ludak—The Washington Post/Getty ImagesCows queuing for their midway milking at United Dreams Dairy, in North Freedom, Wisconsin on May 8, 2024.

The infected dairy worker has a new symptom not reported by the others.

A third dairy worker in the U.S. has tested positive for the bird flu infection that is causing outbreaks in cattle in at least nine states.

The farmworker, from Michigan, was exposed to infected cows and is the first of the three recently confirmed cases to have respiratory symptoms, according to the Michigan Department of Health and Human Services. The previous two people—another in Michigan and one in Texas—did not show any respiratory symptoms but experienced discharge from the eyes. The dairy worker in the latest case worked on a different farm in Michigan than the previous case reported in the state.